On Tue, Nov 26, 2019 at 12:47 AM Gene Heskett <[email protected]> wrote: >
> Based on that, I have hungrily looked at the BS0 type devices, and > wondered why no one has put a stepper drive on the index shaft, with > sufficient geardown to resist cutting forces, I have a much lower price rotary table from LMS. But I think all of them use worm gears and 72:1 reduction. The worm can't be back driven so the motor has no cutting force to resist. Then you also have a built-in 1:72 torque multiplier. You can use a small motor. But if you try that the motor sticks out way to far. It becomes more compact if you use a timing belt and pulleys. and "fold" the motor back 180 degrees. The design of this device is easy to make if you already have the rotary table with 72:1 worm reduction. The belt drive means no need for a flexible coupler or flexible motor mount. amazon.com/Milling-Rotational-Dividing-Tailstock-Reducing <https://www.amazon.com/Milling-Rotational-Dividing-Tailstock-Reducing/dp/B07MDJNDNJ/ref=pd_day0_hl_147_6/140-1288918-2096269?_encoding=UTF8&pd_rd_i=B07MDJNDNJ&pd_rd_r=1e9db8f9-bb53-4b4d-af6c-20b5d39b6f70&pd_rd_w=3jOqX&pd_rd_wg=Ofpll&pf_rd_p=0501877d-5f8c-4ec8-9861-e0476eecc53e&pf_rd_r=GFZ6P181ZWTHT3X6ZA1F&psc=1&refRID=GFZ6P181ZWTHT3X6ZA1F> -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
